Direct Fired

Direct Fired

Flexible units for space heating, make-up air, and ventilation applications

When more air is exhausted from a building than is supplied by the mechanical systems, the building is under a "negative" condition and air will leak into the building through cracks, windows and doors. A negative condition results in the following:

- Flues and stacks will experience a backdraft and cause dangerous contaminants to remain in the occupied space. In the case of flues, the products of combustion may condense and corrode the equipment.
- The exhaust system sees a greater static pressure which reduces the capacity of each fan, resulting in an inadequate removal of contaminants and wasted horsepower.
- Drafts and cross currents will increase, causing an uncomfortable or unhealthy work environment.

Direct Firing eliminates the need for heat exchangers, resulting in 100% efficiency. All products of combustion are introduced into the supply air stream at concentrations well below code requirements. As natural gas is an abundant, clean and low cost fuel that is readily available, this system is very cost effective to operate.

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Features

  • The heavy gauge galvanized steel outer panels are designed to eliminate rust for longer life.
  • Blowers tested to AMCA standards assure proper airflow for efficient operation.
  • The ETL approved, single speed, natural gas fired unit offers adjustable burner profile plates and control system for modulation down to 4% of full input. This delivers the precise amount of gas to the burner, maintaining the exact temperature setting with the lowest possible gas usage.
  • The 140 point final test procedure for every Applied Air Direct Fired unit means fewer start-up problems.
  • For maximum flexibility, units can be installed indoors or outdoors, vertically or horizontally, or include evaporative cooling modules.
  • Direct Fired units are 100% efficient.
  • Heats Without Complications - The Direct Fired gas heating system heats efficiently and cost-effectively using no heat exchanger.
  • Replaces Indoor Air - The Direct Fired gas heating system replaces indoor air that can become chemical laden in an industrial process or commercial cooling application.
  • Provides Ventilation - Fresh air is available simply by turning off the heating section.
  • Air Delivery for Small or Large Buildings - With fans tested to AMCA standards for airflow from 1,600 to 100,000 CFM, you can put warm air right where you need it.
  • Improves Comfort Anywhere, Anytime - Add cost-effective evaporative cooling to your Direct Fired gas heating system for year-round comfort.
  • Cleans and Tempers Incoming Air - The optional filter bank removes airborne particles, and cleaned air is heated to create a more refreshing and comfortable indoor environment.

How Direct Fired Works

100% Efficient Heat

Direct Gas Fired equipment operates by drawing air...either all outside air or a blend...through a fan and across a burner tube and plate assembly at a very specific velocity. The burner tube contains orifices that regulate the flow of natural gas and the burner plates have dozens of laser drilled holes of varying sizes that create turbulence and local velocities for ideal combustion. When those ideal conditions are met the resulting products of combustion consist primarily of water vapor and CO2. When precise patterns of orifices and plate holes are combined with digital controls and sensors the result is a clean and efficient means of heating large volumes of outside air.

how direct fired works

Products

    direct-fired-hvac Commercial Direct Fired Climate Control System DFL
    outdoor-air-heater-dfc Outdoor Series Make-Up Air Heaters DFC
    indoor-air-heater-dfm Indoor Series Make-Up Air Heaters DFM